assign5 - Assignment 5. Dissolve, Field Calculations &...

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1 Assignment 5. Dissolve, Field Calculations & Creating Graphs; Raster vs. Vector Data Dissolve Procedure § Review Gorr/Kurland, Tutorial 3 (‘GIS Outputs’) and Tutorial 8 (‘Spatial Data Processing’). § Dissolve extracts one or more fields from a larger set of fields to aggregate data (e.g., from tracts to districts, from districts to counties). o Dissolve erases the boundaries of adjacent polygons (e.g., districts) that share the same value for the specified attribute. o E.g., use dissolve to reduce demographic data for the 50 U.S. states into a data set’s ‘region’ fields Preliminary . § In ArcCatalog, preview mdtgr2 (table, geography; mdtgr2 was created in Assignment 2 via a table join and selecting block groups with population>0) and examine its metadata (especially ‘Spatial Reference Information’). § In ArcCatalog, Excel, or other statistical software, check for possible data errors (e.g., adding up “Race,” gender, and housing tenure categories to make sure that each series sums to the appropriate
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This note was uploaded on 07/11/2011 for the course SYA 6356 taught by Professor Staff during the Spring '08 term at University of Florida.

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assign5 - Assignment 5. Dissolve, Field Calculations &...

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